4th - Work And Power Flashcards
1
Q
Force, work done, distance moved
A
Work done = force x distance moved
E = Fd
J = Nm
2
Q
Work done, energy transferred
A
Work done = energy transferred
3
Q
Mass, gravitational potential energy, gravitational field strength, height
A
Gravitational potential energy = mass x gravitational field strength x height
GPE = mgh
GPE = joules (J)
g = 10 m/s2 on earth
4
Q
Mass, speed, kinetic energy
A
Kinetic energy = 1/2 x mass x velocity2
KE = 1/2 x m x v2
KE = joules ( J )
5
Q
Conservation of energy law
A
Energy cant be created or destroyed, only change form
6
Q
Power is the rate of what
A
The rate of doing work
7
Q
Work done, time, power
A
Power = work done/ time taken
P = E/t
P = Watt (w)
E = joules ( J )
t = second (s)
